urfave/cli
Cli
This is a framework for building structured terminal applications in Go. It provides the core components necessary to define a command-line interface, including a system for managing commands, sub-commands, and their associated flags.
The library distinguishes itself through an automated help generator that produces formatted usage instructions and manual pages, and a shell completion generator that creates tab-completion scripts for Bash, Zsh, Fish, and PowerShell. It also features a command lifecycle manager to handle pre- and post-execution logic and process exit codes.
The toolkit covers comprehensive argument parsing for various types, including strings, integers, slices, and maps, with support for environment variable overrides and value validation. It also includes utilities for error handling, command categorization, and the generation of Markdown documentation.